<template>
  <div>
    <h1>当前求和为：{{ sum }} </h1>
    <h1>当前求和放大10倍为：{{ bigSum }} </h1>
    <h3>我在{{ school }},学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>


<script>
import { mapState, mapGetters } from 'vuex';
export default {
  name: 'Count',
  data() {
    return {
      n: 1,
    }
  },
  computed: {
    // sum() {
    //   return this.$store.state.sum
    // },
    // school() {
    //   return this.$store.state.school
    // },
    // subject() {
    //   return this.$store.state.subject
    // },

    //借助mapState生成计算属性，从state中读取数据（对象写法）
    // ...mapState({ he: 'sum', xuexiao: 'school', xueke: 'subject' }),

    //借助mapState生成计算属性，从state中读取数据（数组写法）
    ...mapState(['sum', 'school', 'subject']),

    // ------
    // bigSum() {
    //   return this.$store.getters.bigSum
    // },

    //对象写法
    // ...mapGetters({ bigSum: 'bigSum' }),

    //数组写法
    ...mapGetters(['bigSum']),
  },
  mounted() {
    // console.log(this.$store);
    const x = mapState({
      he: 'sum', xuexiao: 'school', xueke: 'subject'
    })
  },
  methods: {
    //加
    increment() {
      // this.sum += this.n
      this.$store.dispatch('jia', this.n)
    },
    //减
    decrement() {
      // this.sum -= this.n

      //直接跳过actions，操作mutation
      this.$store.commit('JIAN', this.n)
    },
    //incrementOdd
    incrementOdd() {
      // this.sum += this.n
      this.$store.dispatch('jiaOdd', this.n)
    },
    //
    incrementWait() {
      this.$store.dispatch('jiaWait', this.n)
    }
  },
}
</script>

<style lang="css">
button {
  margin-left: 6px;
}
</style>